Thanks (5 minor typos)

[tmatha]

Just as a way of saying thank you for a great and insightful article, here is my humble contribution towards correcting 5 minor typos (or what I think are typos). The only one that is of any significance in terms of potential to create confusion is the 3rd one: "set the gradient of the loss for some example i to be 1.0" instead of "set the loss for some example i to be 1.0". Hope I am understanding this correctly. -- Thomas